Book(+/-): secret, book, studies, sciences, literacy, school, education, teacher, writer, librarian, closed things, reveals what is to the right and keep in secret what is to the left
Combinations:
Book+Heart: secret love is revealed
Book+Ring: engagement is announced
Book+Anchor: safe secret
Book+Tower: higher education
Book+Letter: licence
Book+Bear: financial studies, financial secrets revealed
Book+Clouds: cloudy knowledge